Clients using Cisco-LEAP and EAP-FAST authentication are having no problems logging on to thewireless network， but clients using PEAP are failing to log on. Which situation would result in thistype ofproblem？（）

• A、Posture validation has not been enabled
• B、The AAA server is set to accept both MS-CHAP v2 and GTC for PEAP authentication
• C、Clients and server are not using certificates
• D、Clients have been set to validate the server identity